Contract Balances (Tables)

6 Months Ended

Jun. 30, 2018

Contract Balances

Summary of activity in the allowance for doubtful accounts

Allowance for doubtful accounts	Balance at Beginning of Period		Charged to Costs and Expenses		Deductions		Balance at End of Period
	(In thousands)
For the six months ended June 30, 2018	$	15,511	$	47,274	$	(51,197)	$	11,588

Schedule of changes in deferred revenue related to contracts with subscribers

	Contract
	Liabilities
	(In thousands)
Balance as of December 31, 2017	$	699,597
Recognition of unearned revenue		(3,700,172)
Deferral of revenue		3,698,095
Balance as of June 30, 2018	$	697,520